Physiology And Hygiene

Cover Physiology And Hygiene
Physiology And Hygiene
California State Board of Education
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2. Nerves also go to the cells of the gland to control their activity. When we taste, smell, see, or even when we think of, some delicious food the mouth may " water, " 1 1 PHY T 54 Physiology.
as we say, i. E. The salivary glands are, by reflex action, stimulated to activity ; on the other hand, some emotions, such as fear, check the flow of saliva.
Saliva and its Uses. The saliva is mostly water, and, when we are not eating, serves (i) to keep the mouth moist. The water of the saliva soaks th
...e food during mastica- tion and (2) helps the process of grinding; it (3) enables us to taste by dissolving any food that is soluble ; it further (4) enables us to swallow what would otherwise be a dry powder. The special element of the saliva, ptyalin, has the power (5) of changing starch to sugar.
Amount of Saliva. The amount of saliva secreted daily is estimated at three pints. Of course the glands should be allowed to rest between meals. The habit of chewing gum, though supposed to aid digestion, undoubt- edly does far more harm than good.


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